Cisco 870x router flash files

Hello,
I have the following files on my Cisco router - can someone point me in the right direction what these are for and whether they can be ssafely deleted?
Thankyou

c870-xxxx.bin  (IOS)

common.tar
crashinfo_20020409-235323
es.tar
home.shtml
home.tar
sdmconfig-8xx.cfg
sdm.tar
SDM_Backup
vlan.dat

nmxsupportAsked:
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JFrederick29Connect With a Mentor Commented:
c870-xxxx.bin  (IOS)    <--the IOS (do not delete).

common.tar    <--for SDM (web access).  Don't delete if you use SDM.
crashinfo_20020409-235323    <--crash file (you can delete this).
es.tar    <--for SDM (web access).  Don't delete if you use SDM.
home.shtml    <--for SDM (web access).  Don't delete if you use SDM.
home.tar    <--for SDM (web access).  Don't delete if you use SDM.
sdmconfig-8xx.cfg    <--for SDM (web access).  Don't delete if you use SDM.
sdm.tar    <--for SDM (web access).  Don't delete if you use SDM.
SDM_Backup     <--for SDM (web access).  Don't delete if you use SDM.
vlan.dat    <---the VLAN database (do not delete).
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