Does the data recovery technique Consistency checking and Data Carving are equally valid for both HDD and SDD or they are simply for HDD only. These two process is effective in which media?

I’m setting up an off site backup system where my primary office & remote office send each other backups over the internet each night via FTP. My original plan was to purchase 2 basic PCs and then install a 500GB HDD in each PC with serv-u ftp server on them. The "sending" office would use SyncBackSE to send its backup to the PC at the other office where serv-u server is running.

I decided to try and find a more all in one solution. I’ve looked at and purchased a Hammer-Storage N1200 myshare device, but the FTP server on it is very flakey. I was going to try a LaCie Ethernet Big Disk instead but I’ve read a couple reviews saying the FTP server on it was also suspect. I’m willing to spend anywhere upto 0 (each office, 00 total) for a good solution. Does anyone have any recommendations? FYI - My backups will be around 100GB and I’m hoping to use SyncBackSE on the send (or source) side.