Tar, ufsdump,dump,cpio, or dd for poor man's backup ?

I have a Sunblade 100 desktop I use at the company I work for. Since it is a desktop, I cannot request a nightly backup of the system. The Sunblade came with a 20GB Western Digital ide hard drive. I have added a 2nd internal drive which is a Maxtor (Seagate) 40GB ide drive that I use for storing some of my configuration files from the primary 20GB drive.
I want to be able to run a cronjob at least monthly that would copy everything from the primary 20GB drive to the 40GB secondary drive so that if my primary drive goes out, I can switch over to the 40GB easily. Amongst the following, which would be the best tool to use while all filesystems are mounted that would avoid corruption as much as possible ?
tar, ufsdump,dump,cpio, or dd
I don't think I could use dd as I believe it would require that both drives be the same disk geometry. I would like to utilize the secondary 40GB disk as more than just a failover drive if possible, for example, use up to 20GB for the failover and keep the other 20GB for various storage of docs, etc. Any input or suggestions towards the above mentioned tools or any that come with the Solaris 10 OS that I may not have mentioned would be appreciated.

I don't see a reason why LVM can't do this job. Oh yea; you probably didn't allocate space for a metadb on the boot drive.
If you did happen to leave the space; you could Consider this partitioning (don't know what you have):
Target 0 (current boot drive):
s0     /          5GB
s1     swap          4GB
s3     /var          3GB
s5     ((metadb))     15MB
s7     /export/home     "rest of disk"
Target 1
s0     /          5GB + pad to end of cylinder
s1     swap          4GB + pad
s3     /var          3GB + pad
s5     ((metadb))     15MB
s6     /newfs          "rest of disk"
s7     /export/home     ~7.5GB (remainder of disk 0)Even if you didn't allocate a slice; you could reorg your disk to include a slice for the metadb by stealing some space from swap. LVM is pretty automagic once you set it up.
dump/restore also work.
dd would work (in theory) but you have to fsck the target file system as soon as you've copied it across as the FS is open.
Cheers,

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        <TimeCreated SystemTime="2013-01-21T10:16:30.000000000Z" />
        <EventRecordID>261649</EventRecordID>
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        <Computer>NERDS-DC01.nerds.local</Computer>
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    Date:          21/01/2013 10:16:30
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    User:          N/A
    Computer:      NERDS-DC01.nerds.local
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        <Provider Name="SPP" />
        <EventID Qualifiers="0">16389</EventID>
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        <Binary>00000000A5120000981200000000000042BEB7C511CAC619E59C92030000000000000000</Binary>
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