Why a disc space for a subscription changed in Plesk for Windows? It had different value the day before.
The reason why the disc size is different may be that some content was removed or added. This can be done either by FTP, by logging to Plesk interface in domain's File Manager in Domains > example.com > File Manager, or on a Windows server directly.
Generally domain's httpdocs folder is located in
C:\Inetpub\vhosts\example.com\httpdocs on a Windows server. The location can be verified using instructions here:
When some content is removed or added, the disc space will be changed after the Daily Task has ran. It runs on a daily basis and it calculates all domains statistics, including disc usage.