Erasning x-drive, space for other files?

[omarkn]

Good day everyone,

My question is the following:

If i go ahead and make a backup all files,
SD will erase everything on my external drive,

then will it be possible later on after the backup
(and will there be space) to save other files to this external disk?
Or does SD kind of "occupy" the whole of my x-drive?

(Can't see this happening, but just in case )

bw, Omar K N