I am going to look into the suggested Synology RT2600ac model with a separate hard drive. as an option. The Synology model looks to be $200.00 and what ever a hard drive would cost would still be a deal if it saves my operating systems, photos, videos, documents and ect. Any recommendations of hard drives to use with this router?
This is one of those questions where budget is more important than any other consideration.
Cheap laptop drives in neat self-powered USB box are great on a computer where you want something of medium capacity and medium speed with occasional use.
For a backup drive you are plugging into a router.. I would say it is precisely the wrong sort. Pulling current from USB port on a router with a 20W power supply is hugely different to pulling current from a computer with a 250W or larger supply. Bigger disks are faster and more reliable. So my preference is Desktop.
If you can stretch the budget buy a desktop USB drive which are based on faster 3.5" drives. And have their own plug pack power supply.. which is a nuisance but better than overloading the small router supply.
The normal suppliers, WD, Seagate etc are usually fine. These days they tend to use cheaper SMR drives which I try to avoid but it is difficult now to find out this info. LaCie which Bob recommends can be good. I used to buy Touro which was HGST brand or Toshiba.. but you might find they are unavailable or simple absorbed by WD who bought them up.
Honestly just go the cheapest on special drive you can find.
Previously you could buy 4TB desktop or 2TB laptop versions and be sure it CMR/PMR drive.. please just google yourself for this issue. SMR drive. WD got sneaky and started using SMR without telling anyone. I would not spend a lot of time worrying. Keep your eye open for specials on Amazon, Best Buy etc. Especially for bigger drives, >8TB there are plenty of bargains.
WD elements
WD mybook
Seagate backup plus. (naming is difficult but the bigger ones with power supply)
LaCie ??
Just to go back to the original question.. a router like Synology plus a USB drive is cheapest alternative when you need to replace the wifi router and backup functionality of TC.
This question is fairly popular now as you can imagine. Apple has exited the field and of what is available you actually have to do some work to both pick a suitable substitute and get it working.. whereas the Time Capsule was one neat (if somewhat flawed) package.
Please read the thread post I did yesterday.
https://discussions.apple.com/thread/251604031?answerId=253295716022#253295716022
I would strongly encourage everyone who is in this situation to consider a low end entry NAS over a wireless router.
You can get them for around $200.. DS220j although supply is an issue of course with global pandemic. Even an older one second hand from eBay.. etc. Not too old but say previous model or two.. They do last a long time. And people who bought entry level are after 4 bay faster processor models for running video servers and vpn and all that good stuff. So it is good exchange, as backup device an entry level 2bay is perfectly adequate.
You can buy just one disk for now.. and any size you like. In current models up to 12TB.
IMHO 4TB is a good size.. look at the cost per TB and work out sweet point for you.
Long term a NAS .. even entry level is faster, more reliable, better supported, longer life product. It is specifically designed for the job of storing files and backups. A router USB supported hard disk is no where near as good.
You can combine the NAS with any wireless router you like.. the ISP model you use now is probably fine.. and you can pick the right kind of wifi for your home.. be it mesh or ubiquiti etc.. which do not support hard disks of any sort.