Restoring from iCloud backup during sleep mode?

Lvl 10 contributor can’t read! Your question was perfectly clear. 

Various potential causes. We'll never know the exact cause cause no one here knows either and I doubt Apple would provide any meaningful information which might allow us to peek behind the curtain.

I presume you’re connected to PC via Wifi. I’ve only ever connected to PC via USB – I’m not a Mac User. 

The following is based on iTunes running on a Win PC (no experience with iphone connected to Mac). 

References to "PC" mean windows or Mac.  

Some of my suggestions assume access to phone settings. Forcing phone to never auto-lock (go to sleep) may be the solution.  Try my other suggestions & if they don't work, then set up the phone as a new device with your iCloud credentials so you can access the phone settings.   

A 50GB backup stored on iCloud is going to take a long time to download. The progress bar you see on iPhone cannot be relied on. It may move to near finished & hang. It may do nothing for ever & then suddenly race to the end. 

If no visible progress after say 10 -15 mins, I find it won’t finish ever.  50GB may be different.

Do you need to restore? I used to use backup & restore. Now, I just sync what I need to iCloud & rely on the fact that Adobe, Google, MS etc all have their own cloud storage - which doesn't rely on iCloud / Apple iPhone backup. My preferences are not a reason why you shouldn't be able to restore backups.

Make sure phone has a decent charge (say 80% or more). Good idea to keep phone plugged in to prevent Wifi / phone going into power saving mode which might be causing issues.  Make sure phone is charging over USB if connected via cable.

iPhone Settings - Display & Brightness- Auto-Lock - Never

Force PC to stay awake. On a Win PC, search for the power savings options in Control Panel or Settings & work out what power usage profile you are running (on Laptops, you'll find "performance",

"balanced", "power saver". ) Change settings to prevent sleep, screen turning off, etc. Don’t forget to change them back again when this saga is over.

Completely remove iTunes and reinstall (inc. all helpers/ drivers etc) – reboot all devices – routers, switches, fibre modems, etc

WIFI Connection - Look at all network management tools (e.g. wifi router, antivirus software & any network security software) & ensuring that none of the ports or domains Apple servers use are blocked (google what ports Apple needs to be open & also how to view & change those settings on your router / network security software - ask questions on device community pages).

Check your PC WIFI security settings & also your PC device's network security & settings to ensure that the phone is fully trusted & isn't having data or ports blocked. Don't just assume that because your PC connects to the internet that iTunes is connected to iCloud servers.

Use a genuine lightning cable & connect directly via USB. iPhone & probably iTunes know if that cable is genuine or not.

Flaky USB implementation in Windows? Remove every USB device you can.   USB sticks, hard drives, etc Check device manager (or whatever the equivalent is in Mac OS) for any USB issues & resolve those.     

Wifi / network / PC security. Turning all anti-virus software & network security tools off sometimes helps. Make sure you turn everything back on ASAP.

Google the issue you are having along with the device or software that is potentially blocking connections or blocking data over certain ports.  (e.g. "TP Link Deco" and "iphone" and restore from icloud itunes not working / hanging"). Post Qs in device community forums.

At the end of the day there's so much going on that could be causing your issues that its not possible to give you a definitive answer.  But to answer your initial question - yes, devices going to sleep can definitely prevent iPhone accessing data when connected to iTunes (& regardless of whether that data is being access by iTunes from a remote Apple / iCloud server or whether that data is stored locally on the same PC that iTunes is running from).

Back in the 80s and 90s to mid 00s, the device manufacturer would have either created custom software for common PC platforms to transfer from PC to phone, provided PC device drivers

that worked (or could be made to work), provided knowledge base articles for tricky situations, or at the least provided accessible information & guides to enable meaningful troubleshooting to isolate & resolve the issue, with knowledgeable trained customer support or even direct access to inhouse

technicians.  These days, you just get gormless product users who are addicted to the dopamine hit of receiving worthless virtual badges by spamming community pages with drivel blaming you

for not providing sufficient information or for not holding the phone correctly, or wanting the phone to do something phones are expected to do.

Tell us how you get on, what issues you encounter, what worked for you & what didn't work.

Good luck!

There comes a time when you are throwing your good time after a shoddy product.

In your shoes I would be now considering my options to make the retailer take the phone back and provide a full refund. I'm guessing you are in the USA, which as I understand it you are pretty much stuck up the creek without a paddle when it comes to statutory consumer rights (at least in many states).

In New Zealand and also under common law (which applies in all Commonwealth countries and USA) there is an implied warranty that goods have to be fit for purpose. In NZ we go further with the Consumer Guarantees Act 1993 which imposes a guarantee on goods sold for consumer use that the goods be of "acceptable quality". That guarantee applies for a "reasonable period of time" which generally means - the objectively expected lifespan of the goods (for apple smartphones that is at least 3 years - based on Apple's green washing claims & possibly up to 5-6 years). If goods don't perform as advertised or specified then we can enforce the guarantee against the supplier or manufacturer. The supplier warranty entitles us to reject the goods for full refund or replacement if the fault is of a substantial character (& anything affecting the ability to make or receive phone calls falls under that category IMHO) or otherwise expect the goods to repaired at the suppliers' cost within a reasonable time (failing which consumer can elect to reject for refund or replacement). Australia and Canada have similar consumer protection laws.

Wifi calling is an advertised feature. It may not work due to your mobile carrier (a good reason to buy phones from the carrier on whose network you are using it). There comes a time when it is reasonable to say "you can stick this phone where the sun don't shine, I'm sick and tired of trying to troubleshoot this POS to make it work like you advertised. I reject it and want a refund" I think you are at that stage. Even if you don't have meaningful consumer protection laws, I suspect you are at the stage where you can legitimately say "its not fit for purpose".

Many common law jurisdictions also have laws prohibiting "misleading and deceptive conduct". These laws are a codification of the common law action for misrepresentation and negligent misrepresentation. The sting for retailers is when they handle customer issues with flaky hardware / software issues by misrepresenting the customers' remedies and consumer rights. Generally this kind of conduct engages civil rights of action as well as criminal prosecution if local enforcement authorities actually care about predatory and unlawful commercial conduct.

Also note: common law remedies around goods generally allow an abatement of damages to reflect benefit obtained from the goods prior to rejection. Conversely you also have an entitlement to consequential losses caused by the breach of the implied warranty that the goods are fit for purpose. Before you go to the retailer assemble evidence supporting a hefty claim for consequential losses. Also find out how to commence action in a small claims court and calmly explain to the retailer what you are going to do if they don't give you what you want. Arrive prepared with a letter outlining the faults, the remedies you seek and your evidence of losses and claims. Get an email address and email them complaining of lack of response for a few weeks. Once you have a paper trail establishing the retailer's lack of satisfactory response take em to small claims court.

Hopefully

Restoring process or Backup process.

During the restore process, your device is wiped clean and the data and settings are restored from the backup. Where is the question of sleep mode?