Why does UpdraftPlus warn me that my disk has no space left, when in fact it does?

UpdraftPlus just passes on the results of asking PHP “how much free space is left?” –via the disk_free_space PHP function.

Based on support requests we’ve had, it does seem that on some PHP installs, PHP reports that your disk is full when it is not. We do not have any specific information on why this might happen. If it is causing you a problem, then you should ask your web hosting company to take a look. If they give you any useful information then please do send it back to us!