Are Safepoints my answer to backing up?

I am setting up a 4TB MyCloud and would like to implement an automated off-site backup system.

My strategy is to place a compressed copy of the MyCloud into a directory on a PC - and then use 1TB of OneDrive space.

I connected a 500GB HDD to MyCloud and attempted a Safepoint but it complained about there not being enough space. I can’t find anywhere in the MyCloud documentation to determine how much space I need.

My goal was to set up a schedule that copies the Safepoint from the external HDD to the OneCloud directory on the PC.

Are Safepoints a compressed backup of the drive? How much space do I need? Does my strategy sound ok or is there a better way?

Safepoint is not compressed, and you need a 4tb usb to make a safepoint of a 4 tb nas to store all of it.

@GLENN_WILSON Take a look at this information. Read the User Manual for your generation of My Cloud.
https://support.wdc.com/product.aspx?ID=904&lang=en

Be sure to read all information provided along with all Help information provided for you My Cloud.

Safepoints are an exact 1:1 ratio copy of all the files in the same file/folder order that they are on your MyCloud system , no compression is done at all., you will need the same amount of storage that your files have used up on your MyCloud available on your USB drive to do a complete copy.

Another way to automate this without having to resort to running a backup software on your PC would be to another 4TB Mycloud (assuming you are on V2 firmware) elsewhere and run a remote backup.

Note that the single bay/single drive v2.x firmware My Cloud units do not currently support being a remote backup server target. They are missing the remote backup server option in the Dashboard/firmware. See the following WD Support document for more information:

https://support.wdc.com/knowledgebase/answer.aspx?ID=13854

Only the My Cloud Mirror and higher (more expensive) units support being a remote server backup target.