SunnyKate wrote:
I use and need a LOT of storage space.
However you are, or are about to make the SINGLE most common and WORST mistake everyone makes,
1. thinking their computer is a data storage device. iTS NOT
2. falsely thinking their data is safe either A: on the SSD/ HD or B: on a single external HD.
See here, and dont ever let that occur again to yourself:
Methodology to protect your data. Backups vs. Archives. Long-term data protection

The Tragedy that will be, the tragedy that never should be
Always presume correctly that your data is priceless and takes a very long time to create and often is irreplaceable. Always presume accurately that hard drives are extremely cheap, and you have no excuse not to have multiple redundant copies of your data copied on hard drives and stored away several places, lockboxes, safes, fireboxes, offsite and otherwise.
Hard drives aren't prone to failure…hard drives are guaranteed to fail (the very same is true of SSD). Hard drives dont die when aged, hard drives die at any age, and peak in death when young and slowly increase in risk as they age.
Never practice at any time for any reason the false premise and unreal sense of security in thinking your data is safe on any single external hard drive. This is never the case and has proven to be the single most common horrible tragedy of data loss that exists.
Many hundreds of millions of hours of work and data are lost each year due to this single common false security. This is an unnatural disaster that can be avoided by making all data redundant and then redundant again. If you let a $60 additional redundant hard drive and 3 hours of copying stand between you and years of work, then you've made a fundamental mistake countless thousands of people each year have come to regret.
Countless people think they're safe and doing well having a single external backup of their vital data they worked months, years, and sometimes decades on. Nothing could be further from the truth. Never let yourself be in situation of having a single external copy of your precious data at any time.