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windows 系统自带的还原备份功能，底层使用 shadowcopy（阴影卷）技术。
该技术采用了 copy on write 的方式，当每次有新 IO 时，老的数据会被拷贝出来，然后再写新的 IO
最近调用该接口时报错“Event ID 36，User Imposed Limit”，经过调查发现。当阴影卷报错“User Imposed Limit”, 最大可能是创建阴影卷的磁盘没有空间，需要扩容。
参考：
How to Fix VolSnap 36 Error User Imposed Limit – Volume Snapshot
VolSnap 36 event ID may show up as error:
Volume Snapshot Driver, Diff Area health issuesEvent ID 36
Source volsnapThe shadow copies of volume C: were aborted because the shadow copy storage could not grow due to user imposed limit or a related message.
Basically VolSnap 36 is an error event that signals an issue with the diff area being used by VSS.It could be：
a low limit for the diff area, see http://backupchain.com/i/how-…
a disk I/O issue
a bad sector on disk: use chkdsk X: /b to check for bad blocks (may require a reboot)
system load is too high for the diff area to grow fast enough
a corrupt file system issue. Use Chkdsk with /r option, better use /b to also check for bad sectors
The most common cause is #1. Use the solution in the article linked above; however, checking the other potentialities may also be a good idea if the disk hasn’t been checked in a while.
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