Insufficient Storage on 1TB Webdav drive

Hello,

I am new to this list and I hope I am within the netiquette!

I use sitecopy an an ARM device to backup my pictures to a 1TB Webdav Server at 1&1 (a DSL provider, product called "Smartdrive")

After a while, I got 

   failed: 507 Insufficient Storage 

after each file to be uploaded
by sitecopy, even though, there are at least 500MB free.

Are there any size limits in sitecopy which may cause an internal "overflow"
or what could be the reason?

I have now deleted some data to run the backup again (that is why I can't give precise figures right now), but I assume that the problem will come up again - sooner or later.

Can anybody help me please?

Regrads, Dieter


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