Server backup warning: F:\System Volume Information\SRM\quota.md error [0x80070020]

i have configured windows server 2012 essentials r2 domain controller self backup local drives. backup ends without errors, in essentials panel backup state "incomplete" , following warning produced during every backup: 

cannot backup f:\system volume information\srm\quota.md, error [0x80070020] process can not access file because used process.

the directories backup ones shown in picture (the server language es-es): 

as can see, there few directories under f: excluded backup. 

this i've tried far: 

- excluding f:\system volume information backup: results in backup failing following error: error removing [f:\system volume information\srm\] while destination vhd removed. error [0x80070020] the process can not access file because used process. 

- uninstalling wsus role suggestedin thread related issue i've found in microsoft forums.

- reinstalling wsus 

i need here because i'm totally lost , fail understand why backup fails. important server backup ends without error, appreciated.

thanks in advance.

hi,

according description, understanding error [0x80070020] process can not access file because used process prompted when up.

have tried follow information exclude f:\system volume information\srm\  and try again?

seems program/process interfering backup process. disable antivirus programs(if any), restart server or restart server in safe mode network (if possible) , confirm result. 

best regards,
eve wang

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Windows Server  >  Windows Server 2012 Essentials