搜到好多结果：FreeFileSync SyncToy goodsync alwaysync GoodSync……
但好像都 主打同步，而非备份
我的 需求：
- 每天备份N个给定文件（或N个文件夹）
- 最多3个备份档（即超过3个时，自动删除最老的）
- 软件内存占用＜20M
其它增量备份、比较……等功能，都 可有可无
有这样的工具么？
我说怎么眼熟……
是的，autover和另一个更小众的FileHamster，都符合主楼的要求
而且，更强大的，支持realtime backup，即实时备份
这个特性经常用来对付那些，不支持手动存档的游戏……比如escapist、隐形公司等等
但是autover和FileHamster都停止维护了，不知道有没有仍然在更新的替代品
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autover开源了,想要什么功能可以自己加…
是啊，已经解决啦 
其他同学有类似需求的话，力荐cobian backup（已停止维护，但能用） 或 Syncovery（昨天一晚上搜索的结果……）或 Duplicati （便携性、加密、多版本、自动删除旧版本……该有的都有）
可以试试系统自带的robocopy
微软官网有Robocopy GUI版本
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directory monitor
robocopy非常棒！但搜了一下，是不是和主贴的几个一样，不支持 多版本备份，及过期删除老备份(即英文说的CLU特性)？
顺便post一个，搜到的很好的对比表格，供后人参考：
Concerning scheduling, VSS and cleaning up file/folder-backups Duplicati is the best free and portable app for folder-backup-purposes with VSS. For backups of single files I prefer Uranium (portable) or Cobian backup. Uranium Backup has the very important VSS-ability only in the very expensive commercial version, Cobian BU is not portable and is not so good in time-scheduling. But the next Duplicati-version will have a new and better UI, where you can select single files without using regular expressions.
For a good backup functionality it is necessary to cleanup more/older than x backups (CLU) not only older backups than x months, and to configure the schedule of a backup also for each 2nd Monday 10:00 and to pause if the system is busy (Sch).
Comparison of file/folder backup applications:
Comparison … CLU . Sch . Language
SyncBack Free… No … Yes … English only
Cobian Backup … Yes … No … Many
Acronis True Im… Yes … Yes … Many
Duplicati …Yes … Yes … Dan.,En.,Fr.,Germ.,Port.
Areca Backup … No … Yes … English only
Personal Backup … No . Yes … Engl.+German
Saft Backup …Yes … No … Engl.+German
Duplicati is the best free and portable backup application:
Acronis True Image has all necessary functions, has multi-language UI and additionally can do harddisk images with best functions, but it is not free and it is not portable, so you need admin rights to install it.
Both Duplicati and Saft Backup can do backups with Volume Shadow Copy Service (VSS), but Saft Backup cannot do a backup on each second Monday and has no flexible file filter. Cobian Backup is very good, but has the big disadvantage, not to be able to schedule a backup e.g. monthly on each 2nd Tuesday and not to be portable.
robocopy是不直接支持的，但可以用forfiles辅助
批处理(bat)的意义就在于多个命令行工具合作
很少有命令行/Shell不能处理的任务，当然这些不如GUI程序用起来方便省脑
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对了，仍然在更新的替代品，倒是搜到了，但收费软件，没有测试
需要的童鞋可以看下：
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